1977/01/24 Caterpillar

Lightening Holes Not Drilled In Some Crankshafts{1202}

Usage:

1160, 3160, 3208 Engines in All Applications

Not every crankshaft currently machined at the factory for 3208 Engines has lightening holes (holes to make the crankshaft lighter) in the second and third connecting rod journal from the front of the engine. Most crankshafts have lightening holes at these locations, but only when the lightening holes can be drilled to the normal depth. If the lightening holes can not be drilled to the normal depth, or if the lightening holes are not necessary for balance purposes, then they will not be drilled in the two center journals. This has no effect on the operation of the crankshaft in a new engine, a rebuilt engine or a remanufactured engine.

This design change will be seen on 3208 Engines, including the remanufactured engine; replacement crankshafts, remanufactured or reground crankshafts for the engines shown or for remanufactured 1160 and 3160 Engines.

Caterpillar Information System:

1977/01/24 New Cylinder Liners{1216}

1977/01/24 Coupling With A Slip Fit Now Used At Turbocharger Exhaust Outlet Instead Of Coupling With Piston Rings{1061}

1977/01/24 Same Valve Camshaft Assembly Used On Direct Injection Engines Now Used On Engines That Have Precombustion Chambers{1210}

1977/01/24 Adapter For Disassembly And Assembly Of Turbocharger Cartridge{0620,1053}

1977/01/24 Exhaust Valve Guides With A Counterbore Are Now Available{1104}

1977/01/24 Exhaust Manifold Coupling With A Slip Fit Now Used Instead Of A Coupling With Piston Rings{1061}

1977/01/24 Drain All Coolant From Engines Before Shipment For Remanufacturing{0355,1350}

1977/01/17 New Water Temperature Regulator Has A Closer Fit At The Valve Seat To Keep Leakage At A Minimum{1355}

1977/01/17 New Flywheel Assemblies Are Available For Use With Spicer Transmissions{1156}

1977/01/17 New Tie Bars Improve Stability Of The Fuel Injection Test Bench{0652}

1977/01/17 SIRS Component Code List{0331}

1977/01/17 New Special Instruction For Troubleshooting 5P2150 Engine Horsepower Meter{0651,1250}

1977/01/31 New Disconnect Switch Assembly Has Better Resistance To Corrosion{1411}

1977/01/31 Improved Crankshaft Main Bearing With Higher Strength Aluminum Alloy{1203}

1977/01/31 New Remote Control Switch Assembly For Electric Hydraulic Pumps{0621,0623}

1977/01/31 Transportation Notice Plate Is No Longer Needed For Pressurized Nitrogen Cylinders{7557}

1977/01/31 Low Emission Truck Engines With Exhaust Gas Recirculation (EGR) Systems{1050}

1977/02/14 Correct Use Of Plugs In Drain Holes Of Hydraulic Pumps That Have Two Seals On The Shaft-Use A Plug In Drain Hole Except With Water Glycol Systems{5055,5073}

1977/02/14 New 5P7307 Engine Turning Tool Group Fits All Engines{0611}

1977/02/14 Test Used Fuel Nozzles Before You Install New Nozzles; Tips On Test Procedures{1254,0651,0336}

1977/02/14 Diesel Fuel Recommendation Expanded{1280}

1977/02/28 Modification To Holder To Machine Counterbore On Cylinder Block{0664,1201}

1977/02/28 Hardened Washers Now Used Between The Bolt Heads And The Engine Front Support To Keep These Bolts Tight{1153}

1977/02/28 Clip Now Used To Hold Coolant Line For The Turbocharger{1052,1380}